Improvement in dental lathes



ltion. 1

thrust ndert ELIAS c. EISHEL, or. WHITE HAVEN, rEuNsYLnANIA.

Letters Patent No. 110,869, dated January 10, 1871; antedated December`v31, 1870.

iMPRovEMENT nv DENTAL LATHEs.

The 4Schedule referred to in these Letters Patent and -making part ofthe same.

-To all whom it mayv concern:

@Be it known that I, ELIAs C. RISHEL, of White Haven, in the county ofLuzerne and Stat-eef Pennsylvania, have invented a new and usefulImprove- .ment in Dental Lathes; and I do hereby declare thatthefollowng isla frh-clear, and exact description thereof', which willenable others skilled in the art to" make und use the same,'ref`ereneebeing had tothe accompanying drawing forming part-oi this specifica--"lhis invention relates to improvements'indental lathes, and consistsinan arrangementof the man-A liel and the bearingstherefor,l to' admitofreadily'. removing the mandrel from the supports,'as isoften requiredfor shifting or chungiugfthe wheels on the malnirel `AFigure l is a sideelevation of agpart'ot' a dental lathe;A I

- "Figure 2 is an end View of the same and Figure 3 is a section ou theline x :c ot'fig. l..

Similar letters of 'reference indicatev correspomling parts.

A represents the mandrel; j

D, the supports forthe bearings-,and

For dental purposes it isoften. necessaryftoplace grinding orotherdisks, or wheels, on the mandrel against the side ofthe pulley O, or inother places between the bearings, and to change them from time to time.1

I therefore propose to .fit the mandrel with journuls', tapered in part,as shown at a, and make a correspondingly-shaped bearing in one support,as s how'n at-b, and provide an opening, d, through the other bearingsupport', sc that by n'rst passing the ende ofthe mandrel through thehole at b, from the direc- -tionof the otherbearing, the journal at theend j" nray be passed sidewise through the opening'cl into the hole forthe journal, which is made larger 'thanv 'the said journal, for thereception of a bush, D, hav? lnga hole corresponding to the shape of thejournal,`and shoved endivise into the hole for it, and along thejournal, to bear against the tapered part and force the tapered part, atthel other' end, against its' beary ings, to hold the mandrel againstend movement,-.the f' bush being held in position byaset-screw, E.

After the mandrel is put imposition the nuts F .l

are `screwed onto Athe ends of the mandrel; they arei used in connectionwith other nuts to bev screwedon for clamping disks or `other things onthe chiefly screwed ends.

` vTo take the' mandrel ont, the-bush D is first moved ont of thebearing su'pport,'(the nnts'F being taken olii) the end in the notchedhearing-is moved out through the notch, and the end, ntf-b.' is .drawnout .the Way it was putin. I may arrange-both the bearing supports-withnotches :Zand bushes 1 so as .to take'. both journals without moving themandrel endwise. i lhe tapered bearing and journal at l) admit of movingthe other .end of the mandrel laterally after ,being irstioved endwiseslightly','when the bush D' is removed. ,This could not. bedonev 'if'this bearing and journal were cylindrical. Y v 'lhis sleeve, with)the-taperedV hole, and the setscrew for holding it,'m`ayvbe used inconnection with the tapered journal of any mandrel," whether arranged lin these notched bearings'or not, for taking-up the slack can-sed bywear','n.nd I propose'to make such lThe nuts are'also intended'to, actas shoulders against the bu'shesin cases when great end pressureoecur's,` so as -to' prevent the'wedging of the tapered bearing with thesleeve whenjexposed to the end pressure, another n 'ut being'put on vandscrewed against the'one bearing o'nvthe end of the bush, to

p revent its being turned by the friction ther-eat.-

Hav'ing thus described myinveution,

l claim' as new and desire to secure by Letters i Patente# f 1. Themandrel A, provided with tapering and threaded journals and nuts, asdescribed, in combi.v

nation with the tapered bearing b and sleeve D, the latter arranged in abearing support, having a notch', d, and set-screw E, as`specilied.

2. The combination, with the bearing support und tbe'rnandrehcf theadjustable bush D and the set# screw E, substantially as specified.

lh'e above speeitication of my invention signed by me this 27th day ofApril, 1'870.

f ELIAS O. RISHEL. Witnesses: Y

GEO. W. MABEE, S. MABEE.

